FCom Fuji Crystal · FSF-5050 Series
413 & 415.4 MHz SAW Bandpass Filters
FSF-5050-413M · FSF-5050-415M4
Compare a 413 MHz single-ended option with a 415.4 MHz balanced option. Both use a 5.0 × 5.0 mm SMD package, with different signal pins, passbands and operating limits.
Model Selection
Select by interface as well as frequency
The two models have different signal-pin functions and test interfaces. Shared package dimensions do not establish interchangeability. The passband ranges are not specified 3 dB bandwidths.
Single-ended signal path
FSF-5050-413M
413 MHz
Specified passband: 412–414 MHz; not a 3 dB bandwidth
- Interface
- 50 Ω single-ended
- Insertion loss
- 1.8 dB typ. / 3.0 dB max.
- Amplitude ripple
- 0.3 dB typ. / 1.5 dB max.
- VSWR
- 1.4 typ. / 2.2 max.
- Operating range
- −40 to +85 °C
Balanced-to-balanced signal path
FSF-5050-415M4
415.4 MHz
Specified passband: 412.9–417.9 MHz; not a 3 dB bandwidth
- Interface
- 200 Ω balanced
- Insertion loss
- 2.2 dB typ. / 3.6 dB max.
- Amplitude ripple
- 0.65 dB typ. / 2.1 dB max.
- VSWR
- 1.3 typ. / 2.2 max.
- Operating range
- +15 to +35 °C
The passband ranges above are specified performance intervals for insertion loss, amplitude ripple and VSWR. They are not 3 dB bandwidths. Confirm the required passband definition before selecting a model.
Six key parameters per model
Electrical specifications
“—” means not specified, not zero. Min., Typ. and Max. retain their supplied meanings. Operating temperature ranges do not establish the temperature at which each electrical value was measured.
FSF-5050-413M
Scroll horizontally to view all columns.
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 413 | — | MHz | Typical |
| Specified passband | — | — | — | MHz | 412–414 MHz; not a specified 3 dB bandwidth |
| Insertion loss | — | 1.8 | 3.0 | dB | 412–414 MHz |
| Amplitude ripple | — | 0.3 | 1.5 | dB | 412–414 MHz |
| VSWR | — | 1.4 | 2.2 | Ratio | 412–414 MHz; dimensionless |
| Operating temperature | −40 | — | +85 | °C | Operating limits; not measurement temperature |
The 50 Ω source and load values specify single-ended test terminations, not intrinsic device impedances. No reference measurement temperature or 3 dB bandwidth is specified.
FSF-5050-415M4
Scroll horizontally to view all columns.
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 415.4 | — | MHz | Typical |
| Specified passband | — | — | — | MHz | 412.9–417.9 MHz; not a specified 3 dB bandwidth |
| Insertion loss | — | 2.2 | 3.6 | dB | 412.9–417.9 MHz |
| Amplitude ripple | — | 0.65 | 2.1 | dB | 412.9–417.9 MHz |
| VSWR | — | 1.3 | 2.2 | Ratio | 412.9–417.9 MHz; dimensionless |
| Operating temperature | +15 | — | +35 | °C | Operating limits; not measurement temperature |
The 200 Ω source and load values specify balanced test terminations for the differential ports, not a 200 Ω termination from each pin to ground. A storage temperature range is listed separately in the supplied document and must not be substituted for the operating range. No reference measurement temperature or 3 dB bandwidth is specified.
Stopband attenuation is absolute and referenced to 0 dB for both models. VSWR is a dimensionless ratio, as shown in the supplied FCom document. Consult the combined FCom PDF for complete attenuation bands, maximum ratings and storage limits.
Application Fit
Typical applications
413 MHz receiver front ends
Bandpass signal selection over the specified 412–414 MHz range when the receiver is designed around the single-ended test interface and the stated operating limits.
415.4 MHz differential RF / IF paths
Bandpass filtering over 412.9–417.9 MHz for a balanced signal path that meets the 200 Ω source/load conditions and the +15 to +35 °C operating range.
Custom receiver band selection
Select the model whose passband, insertion loss, rejection bands and interface requirements fit the intended receiver. Check the full attenuation data for interferers outside the signal band.
Integration Notes
Interfaces, matching and PCB evaluation
FSF-5050-413M
The reference measurement circuit uses a 50 Ω single-ended source and load, with signal connections at pins 2 and 6. It shows no external matching components. The FCom pin table labels both signal pins Input/Output; confirm the required direction for the actual design.
FCom lists pins 1, 3, 5 and 7 as ground and pins 4 and 8 as case ground. The 50 Ω values describe test terminations, not intrinsic device impedances.
FSF-5050-415M4
Use both pins of each differential port: pins 1 and 2 for balanced input, and pins 5 and 6 for balanced output. The source and load test terminations are 200 Ω per balanced port; do not interpret this as 200 Ω from each signal pin to ground.
Pins 3 and 7 are ground; pins 4 and 8 are case ground. A 50 Ω single-ended conversion network is not specified. Provide the actual circuit requirements for interface evaluation.
Pins 1 and 5 change from ground on 413M to signal connections on 415M4. Preserve the correct model-specific pin assignment when evaluating a footprint or replacement.
Shared outline · different signal pins
Package & pin assignment
The supplied FCom pages show a 5.0 × 5.0 mm, 8-pad leadless SMD package with a maximum height of 1.5 mm for both models. Use the applicable FCom drawing for pad dimensions and verify the mounting view before PCB release.
Model-specific signal assignment
Do not infer polarity or pad orientation from the product photograph. The pin functions below follow the supplied FCom documents. Contact FCom for other pin-configuration requirements.
The shared package outline does not establish a common pinout. Confirm the signal direction and balanced pair assignment for the selected model.
| Pin(s) | FSF-5050-413M | FSF-5050-415M4 |
|---|---|---|
| 1 | Ground | Balanced input, paired with pin 2 |
| 2 | Input/Output | Balanced input, paired with pin 1 |
| 5 | Ground | Balanced output, paired with pin 6 |
| 6 | Input/Output | Balanced output, paired with pin 5 |
| 3, 7 | Ground | Ground |
| 4, 8 | Case ground | Case ground |
Selection and Design-In Support
What to include in your inquiry
Share your required passband, single-ended or balanced interface, source/load conditions and temperature range. Include the selected model, sample quantity and estimated usage so the requirements can be reviewed against the appropriate configuration.
Confirm the applicable FCom production specification, pin configuration and complete ordering code before design release.
Engineering Questions
Frequently asked questions
What is the main difference between the two models?
FSF-5050-413M uses 50 Ω single-ended source and load test terminations. FSF-5050-415M4 uses 200 Ω balanced source and load test terminations, with pins 1 and 2 forming the input pair and pins 5 and 6 forming the output pair. Their passbands, temperature limits and pin functions also differ.
Are 412–414 MHz and 412.9–417.9 MHz 3 dB bandwidth specifications?
No. They are the specified frequency ranges for insertion loss, amplitude ripple and VSWR. Neither supplied model document gives a 3 dB bandwidth value. Do not label these ranges as 3 dB bandwidth or infer an unlisted attenuation-defined bandwidth.
Can I replace the 413 MHz model with the 415.4 MHz model on the same PCB?
Direct replacement is not established. Pins 1 and 5 are ground pins on FSF-5050-413M but signal pins on FSF-5050-415M4. The source/load configuration changes from 50 Ω single-ended to 200 Ω balanced, and the operating ranges differ. Review the full interface and pin assignment before a substitution.
Can the 415.4 MHz model connect directly to a 50 Ω single-ended circuit?
The supplied data specify balanced-to-balanced operation with 200 Ω source and load terminations. They do not specify performance for a direct 50 Ω single-ended connection. Any interface conversion or matching network must be selected and evaluated for the actual circuit; no verified component values are provided for that conversion.
Does the 415.4 MHz model operate from −40 to +85 °C?
That is its storage temperature range. Its specified operating range is +15 to +35 °C. The 413 MHz model has an operating range of −40 to +85 °C. A reference measurement temperature is not stated for either model in the supplied data.
What should I include in a technical inquiry?
Include the selected model or center frequency, required passband or bandwidth definition, single-ended or balanced interface, source and load requirements, operating temperature, sample quantity and estimated usage. Confirm the applicable FCom production specification, pin configuration and complete ordering code before design release.